Source, transport and fate of terrestrial organic carbon on the western Mediterranean Sea, Gulf of Lions, France

Tesi, Tommaso; Miserocchi, Stefano; Goñi, Miguel A.; Langone, Leonardo

doi:10.1016/j.marchem.2007.01.005

Cited by 116 publications

(113 citation statements)

References 62 publications

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“…14) shows a positive pattern in the close vicinity of the Rhone River mouth extending over 30 km until 200 m depth. The prodelta region is the main deposition area of terrestrial POC in the model, which is in agreement with numerous previous studies (Calmet and Fernandez, 1990;Durrieu de Madron et al, 2000;Tesi et al, 2007). On the contrary, one could expect that such positive influence of terrestrial POM inputs on POC deposition would concern the entire Gulf of Lions.…”

Section: Influence Of Terrestrial Pom Inputs On Poc Depositionsupporting

confidence: 91%

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Functioning of the planktonic ecosystem on the Gulf of Lions shelf (NW Mediterranean) during spring and its impact on the carbon deposition: a field data and 3-D modelling combined approach

et al. 2011

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Abstract.A coupled hydrodynamic-biogeochemical modelling is developed to address main mechanisms that drive the particulate organic carbon (POC) deposition in the Gulf of Lions (NW-Mediterranean). Low-salinity water (LSW, salinity <37.5) lenses detached from the Rhone River plume under specific wind conditions tend to favour the biological productivity and provide a good opportunity for validating a planktonic ecosystem modelling. A specific calibration dedicated to river plume ecosystems is then proposed and validated using in situ measurements within such LSW lens (BIOPRHOFI cruise -May 2006) and on the Gulf of Lions. During spring 2006, the POC deposition is maximal on the prodelta area and within the coastal area in the Gulf of Lions. Organic detritus mostly contribute to the total POC deposition (82-92 %) whereas the contribution of living organisms (microphytoplankton) appears lower than 17 %. Exploring both influences of terrestrial inputs from the Rhone River and planktonic ecosystems on the POC deposition on the shelf, we estimated that the contribution of terrestrial POM inputs to the total POC deposition is lower than 17 % at the shelf scale during the study period, with maxima during peak discharges of the Rhone River. The main deposition area of terrestrial POC is found in the vicinity of the river mouth in agreement with sediment data. On the other hand, a remarkable influence of marine biological processes on the POC deposition is highlighted further on the shelf (from 60 to 80 m depth). A tight feedback between zooplankton and POM contents in the water column is proposed to explain Correspondence to: P. A. Auger (pierre-amael.auger@aero.obs-mip.fr) the control of POC deposition by zooplankton: terrestrial POM inputs would favour the development of living organisms through photosynthesis and grazing processes increasing the retention of organic matter within the food web. By favouring the development of large-sized zooplankton, LSW lenses may have paradoxically a negative impact on the carbon deposition on the shelf. In the same way, peak discharges of the Rhone River finally increase the gradient of POC deposition between the prodelta and the offshore area in the Gulf of Lions. The biogenic elements from the Rhone River are then exported further offshore through advection of zooplankton communities on the Gulf of Lions shelf.

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Section: Influence Of Terrestrial Pom Inputs On Poc Depositionsupporting

confidence: 91%

“…11). The POM contents are highly dependent on the whole food web activity as well as sedimentation and recycling processes in the water column (Tesi et al, 2007;Aller, 1998). As a consequence, a realistic representation of their vertical distribution is probably the most complicated to achieve.…”

Section: Stocks Outputsmentioning

confidence: 99%

Functioning of the planktonic ecosystem on the Gulf of Lions shelf (NW Mediterranean) during spring and its impact on the carbon deposition: a field data and 3-D modelling combined approach

et al. 2011

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“…A trend of lower carbon-normalized yields of higher plant biomarkers (LC-SAFAs) was observed with distance from the river mouth, consistent with their terrestrial origin and the retention of coarse-sized particles and plant debris within the prodelta as a consequence of lateral hydrodynamic sorting (Tesi et al, 2007). Two other terrestrial biomarkers (linoleic acid = 18:2ω6 and α-linolenic acid = 18:3ω3) clustered in G3.…”

Section: Organic Matter Sources Inferred From Biomarkerssupporting

confidence: 53%

Biogeochemistry of fatty acids in a river-dominated Mediterranean ecosystem (Rhône River prodelta, Gulf of Lions, France): Origins and diagenesis

Pruski

Buscail

Bourgeois

et al. 2015

Organic Geochemistry

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Major rivers transfer high loads of continental particulate organic matter to deltaic environments, where the impact on the biogeochemistry and productivity of coastal sediments depends on the sources and lability of these inputs. Our aims are to provide new insights into the reactivity of riverine inputs in coastal environments and to delineate the parameters controlling their fate in these dynamic systems. Sediment cores were collected from a Mediterranean deltaic system (the Rhône prodelta and its adjacent shelf) during a period of moderate river discharge (Spring 2007) and analyzed for their fatty acid composition. Sediment properties were also described using biochemical bulk analyses (organic carbon and lipids), granulometry and profiles of redox potential. Based on the bulk compositional changes and hierarchical clustering of the fatty acid biomarkers, we determined the principal sources of organic matter and their spatial distribution.Fatty acids were primarily of continental origin in the prodelta, shifting to a higher contribution from marine sources in the shelf area. Fatty acids derived from both continental and marine sources were efficiently degraded in the sediments by microbial decay processes in the upper oxic layer. Degradation rate constants calculated from the down-core decreases in concentrations indicate that fatty acid degradation was enhanced in sediments influenced by the Rhône River.The most important parameters affecting fatty acid preservation were the inherent stability of individual molecular components and their physical association with mineral matrices, the source and freshness of the inputs, and the depositional environment (redox condition, accumulation rates).3

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“…With an average discharge over 1000 m 3 s -1 (Bourrin et al, 2008), it delivers more than 80% of the total freshwater input (Sánchez-Vidal et al, 2009) and more than 90% of the total sediment input (Tesi et al, 2010). The Rhône discharges an annual organic carbon input of 19.2 ± 6 · 10 4 t C year -1 , whereas the total river input for the Gulf of Lions is estimated in 24 ± 10 · 10 4 t C year -1 (Tesi et al, 2007). In addition, three small rivers (the Agly, the Têt and the Tech) discharge in the slope nearby the Cap de Creus Canyon head, with an average discharge of less than 10 m 3 s -1 .…”

Section: Particulate Matter Input Transport and Depositionmentioning

confidence: 99%

“…becoming an important sediment export vector from the shelf to the slope (Tesi et al, 2007). The river supply becomes maximum during marine storms since these ones are often accompanied by river floods that result from excess of precipitation (Ulses et al, 2008).…”

Section: Particulate Matter Input Transport and Depositionmentioning

confidence: 99%

Living deep-sea benthic foraminifera from the Cap de Creus Canyon (western Mediterranean): Faunal–geochemical interactions

Contreras-Rosales

Koho

Duijnstee

et al. 2012

Deep Sea Research Part I: Oceanographic Research Papers

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Source, transport and fate of terrestrial organic carbon on the western Mediterranean Sea, Gulf of Lions, France

Cited by 116 publications

References 62 publications

Functioning of the planktonic ecosystem on the Gulf of Lions shelf (NW Mediterranean) during spring and its impact on the carbon deposition: a field data and 3-D modelling combined approach

Functioning of the planktonic ecosystem on the Gulf of Lions shelf (NW Mediterranean) during spring and its impact on the carbon deposition: a field data and 3-D modelling combined approach

Biogeochemistry of fatty acids in a river-dominated Mediterranean ecosystem (Rhône River prodelta, Gulf of Lions, France): Origins and diagenesis

Living deep-sea benthic foraminifera from the Cap de Creus Canyon (western Mediterranean): Faunal–geochemical interactions

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